Function s2n_tls_sys::s2n_psk_configure_early_data

pub unsafe extern "C" fn s2n_psk_configure_early_data(
    psk: *mut s2n_psk,
    max_early_data_size: u32,
    cipher_suite_first_byte: u8,
    cipher_suite_second_byte: u8
) -> c_int

Configures a particular pre-shared key to allow early data.

max_early_data_size must be set to the maximum early data accepted by the server.

In order to use early data, the cipher suite set on the pre-shared key must match the cipher suite ultimately negotiated by the TLS handshake. Additionally, the cipher suite must have the same hmac algorithm as the pre-shared key.

@param psk A pointer to the pre-shared key, created with s2n_external_psk_new. @param max_early_data_size The maximum early data that can be sent or received using this key. @param cipher_suite_first_byte The first byte in the registered IANA value of the associated cipher suite. @param cipher_suite_second_byte The second byte in the registered IANA value of the associated cipher suite. @returns A POSIX error signal. If successful, psk was updated.